iddqd/support/
hash_builder.rs

1/// Default hasher for hash map types.
2///
3/// To disable this hasher, disable the `default-hasher` feature.
4#[cfg(feature = "default-hasher")]
5pub type DefaultHashBuilder = foldhash::fast::RandomState;
6
7#[cfg(not(feature = "default-hasher"))]
8mod dummy {
9    use core::hash::{BuildHasher, Hasher};
10
11    /// Dummy default hasher for hash map types.
12    ///
13    /// The `default-hasher` feature is currently disabled.
14    #[derive(Clone, Copy, Debug)]
15    pub enum DefaultHashBuilder {}
16
17    impl BuildHasher for DefaultHashBuilder {
18        type Hasher = Self;
19
20        fn build_hasher(&self) -> Self::Hasher {
21            unreachable!("this is an empty enum so self cannot exist")
22        }
23    }
24
25    impl Hasher for DefaultHashBuilder {
26        fn write(&mut self, _bytes: &[u8]) {
27            unreachable!("this is an empty enum so self cannot exist")
28        }
29
30        fn finish(&self) -> u64 {
31            unreachable!("this is an empty enum so self cannot exist")
32        }
33    }
34}
35
36#[cfg(not(feature = "default-hasher"))]
37pub use dummy::DefaultHashBuilder;
iddqd/support/hash_builder.rs

iddqd/support/
hash_builder.rs
